Malicious PDF — malware analysis report

Static analysis result for SHA-256 b26bf95c7c40a843…

MALICIOUS

PDF

75.5 KB Created: 2021-02-25 16:31:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: d54b38bf410fb4aef07d48233c57d16d SHA-1: 713eeecfbfcd65a7f5de072d86c21d2ca4576b56 SHA-256: b26bf95c7c40a8438c56af018bd1d745bea418ca6928f48576dbd37a9009d656
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains embedded URLs that redirect to external websites, one of which is flagged as malicious. The ML classifier strongly indicates maliciousness, and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a link farm designed for SEO manipulation, likely to host malicious content or phishing lures. No scripts were extracted, but the presence of external URIs and the ML classification point to a phishing or malicious content delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://bologen.ru/wix?keyword=biology+chapter+3+cell+structure+and+function+answer+key PDF link annotation
    • https://cdn.sqhk.co/pirujezexod/ehigNhf/tabixovapelokar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426960/normal_6027d7cc9c448.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383446/normal_5fd68ae7a5016.pdfIn PDF document text
    • http://presente-top.store/pazaresevalerijebotef18lt.pdfIn PDF document text
    • https://cdn.sqhk.co/motulobugaji/7ckxqxi/dog_runs_for_sale_in_cork.pdfIn PDF document text
    • https://cdn.sqhk.co/vazoguzo/bzsdAhb/11111719892.pdfIn PDF document text
    • http://nizavevorupuj.mywebcommunity.org/sutemetur.pdfIn PDF document text
    • http://cetakchantek.com/3454565070ncka0.pdfIn PDF document text
    • http://ebay-coupon.ru/643171742858no9s.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://kopolug.myartsonline.com/61716075232.pdfIn PDF document text
    • http://vasozebuxez.rf.gd/spring_framework_latest_release_download_for_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/bovenotojitowe/how_to_design_beam_reinforcement.pdfIn PDF document text
    • http://menivafanar.epizy.com/roman_numerals_1_to_1000_chart_download.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7D 5768 bytes
SHA-256: cc45d6161ee67fd0cd8ae7b70885118f8ba59a0a73df772294191fc25edaef9c
font_01_sfnt_off0000f033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF033 10084 bytes
SHA-256: 448375eba350b2fd1b38bf1df8ecbb5969f8b475ad6ecfb53c5938499daefdea
font_02_sfnt_off000112af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112AF 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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